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polygon

(Encyclopedia)polygon, closed plane figure bounded by straight line segments as sides. A polygon is convex if any two points inside the polygon can be connected by a line segment that does not intersect any side. I...

White House

(Encyclopedia)White House, official name of the executive mansion of the President of the United States. It is on the south side of Pennsylvania Ave., Washington, D.C., facing Lafayette Square. The building, constr...

Chinguetti

(Encyclopedia)Chinguetti, town, central Mauritania, on the Adrar Plateau east of Atar. Founded in the 8th cent., it was a center on several trans-Saharan trade routes...

Guðmundsson, Kristmann

(Encyclopedia)Guðmundsson, Kristmann krĭstˈmän gvüᵺˈmünsôn [key], 1901–83, Icelandic novelist. Guðmundsson lived in Norway from 1924 to 1937 and wrote in both Norwegian and Icelandic. His sensitive nov...

mean

(Encyclopedia)mean, in statistics, a type of average. The arithmetic mean of a group of numbers is found by dividing their sum by the number of members in the group; e.g., the sum of the seven numbers 4, 5, 6, 9, 1...

solar constant

(Encyclopedia)solar constant, the average amount of radiant energy received by the earth's atmosphere from the sun; its value is about 2 calories per min incident on each square centimeter of the upper atmosphere. ...

galleon

(Encyclopedia)galleon, oceangoing warship used by the European naval powers in the 15th and 16th cent. A large, cumbersome vessel, the galleon was three-masted and square-rigged, usually with two decks, and with it...

minaret

(Encyclopedia)CE5 Minaret minaret mĭnərĕtˈ [key], tower, used in Islamic architecture, from which the faithful are called to prayer by a muezzin. Most mosques have one or more small towers, which are usuall...

Cambridge, cities, United States

(Encyclopedia)Cambridge. 1 City (2020 pop. 13,096), seat of Dorchester co., E Md., Eastern Shore, a port of entry on the Choptank River at its mouth on ...

Andromeda, in astronomy

(Encyclopedia)Andromeda, in astronomy, northern constellation located to the NE of Pegasus and to the S of Cassiopeia. Its brightest star, Alpheratz (Alpha Andromedae), marks the northeast corner of the Great Squar...